如何使用ShapeDrawable创建可点击的按钮? [英] How-to create a clickable Button with a ShapeDrawable?

问题描述

我正在尝试在Canvas上绘制形状并获取有关用户在该Canvas上执行的点击的信息.

I'm trying to draw a shape on a Canvas and get information about the clicks that the user performs on that Canvas.

我创建了一个扩展Button类的类.

I created a class which extends the Button class.

  class CustomDrawableButton extends Button {
    private final ShapeDrawable mDrawable;
    int x = 50;
    int y = 50;
    int width = 30;
    int height = 30;

    public CustomDrawableButton (Context context) {
       super(context);
       mDrawable = new ShapeDrawable (new OvalShape ());
       mDrawable.getPaint().setColor(Color.GREEN);
       mDrawable.setBounds(x, y, x + width, y + height);
    }

    protected void onDraw(Canvas canvas) {
      mDrawable.draw(canvas);
    }
  }

然后，在还扩展了View的类中，我添加了实例化和侦听器:

Then, in a class which also extends View, I added the instantiation and a listener:

  CustomDrawableButton mCustomDrawableButton = new CustomDrawableButton(getBaseContext());

  layout.addView(mCustomDrawableButton);

  mCustomDrawableButton.draw(canvas);

  mCustomDrawableButton.setOnClickListener(new View.OnClickListener() {
    public void onClick(View view) {
      System.out.println("Yey clicked");
     Toast.makeText(view.getContext(), "Yey", Toast.LENGTH_LONG).show();
    }});

执行此操作时，它无法检测到图像/按钮上的点击.我已经读过ShapeDrawable对象不能是可单击的"，但是我一直期望它能够工作，因为我正在扩展Button(它是一个视图，并且是可单击的").

When this is executed, it is not able to detect the clicks on the image / button. I have read that ShapeDrawable objects can't be "clickable", but I was expecting this to work since I'm extending the Button (which is a View and is "clickable").

这可能吗?如果不是这样，您能否引导我获得某种方式，以获取有关在画布"或视图"上按下的屏幕坐标的信息?

Is this possible? If not this way, can you direct me to some way to get information about the screen coordinates that were pressed on a Canvas or a View ?

谢谢.

推荐答案

在进行一些搜索之后，这里有一个教程，展示了如何通过获取触摸屏的位置来使用它.

After some searching here's a tutorial that shows how to do it using by getting the touched screen position.

http://marakana.com/tutorials/android/2d-graphics -example.html

仍然不知道如何通过将touched事件自动绑定到按钮来做到这一点.如果有人知道该怎么做，请这样说.

Still don't know how to do it by automatically binding the touched event to a button. If anyone knows how to do it, please say so.

谢谢.

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